6891368057 has 4 divisors (see below), whose sum is σ = 7875849216. Its totient is φ = 5906886900.

The previous prime is 6891368023. The next prime is 6891368069. The reversal of 6891368057 is 7508631986.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6891368057 - 2¹⁶ = 6891302521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6891368087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492240569 + ... + 492240582.

It is an arithmetic number, because the mean of its divisors is an integer number (1968962304).

Almost surely, 2^6891368057 is an apocalyptic number.

It is an amenable number.

6891368057 is a deficient number, since it is larger than the sum of its proper divisors (984481159).

6891368057 is an equidigital number, since it uses as much as digits as its factorization.

6891368057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984481158.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 6891368057 is about 83014.2641779110. The cubic root of 6891368057 is about 1902.9840511937.

The spelling of 6891368057 in words is "six billion, eight hundred ninety-one million, three hundred sixty-eight thousand, fifty-seven".